138178715451 has 16 divisors (see below), whose sum is σ = 219712740864. Its totient is φ = 75526254144.

The previous prime is 138178715447. The next prime is 138178715453. The reversal of 138178715451 is 154517871831.

It is not a de Polignac number, because 138178715451 - 2² = 138178715447 is a prime.

It is a super-2 number, since 2×138178715451² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 138178715394 and 138178715403.

It is not an unprimeable number, because it can be changed into a prime (138178715453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143041666 + ... + 143042631.

It is an arithmetic number, because the mean of its divisors is an integer number (13732046304).

Almost surely, 2^138178715451 is an apocalyptic number.

138178715451 is a deficient number, since it is larger than the sum of its proper divisors (81534025413).

138178715451 is a wasteful number, since it uses less digits than its factorization.

138178715451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286084330.

The product of its digits is 940800, while the sum is 51.

The spelling of 138178715451 in words is "one hundred thirty-eight billion, one hundred seventy-eight million, seven hundred fifteen thousand, four hundred fifty-one".